Question

我在用户控件中有2个标签和一个属性：这是财产：

private int _SelectIndex;
[Browsable(true)]
public int SelectIndex { get; set; }

和2个标签：

Label lbl1, lbl2;
void iControl()
{
      lbl1 = new Label();
      lbl2 = new Label();
      lbl1.Name = "lbl1";
      lbl2.Name = "lbl2";
      lbl1.Click += lbl_Click;
      lbl2.Click += lbl_Click;
      this.Controls.Add(lbl1);
      this.Controls.Add(lbl2);
}

点击：

void lbl_Click(object sender, EventArgs e)
{
    Label selectedlbl = sender as Label;
    if(selectedlbl.Name == "lbl1") 
          this.Select = 1;
    else
          this.Select = 2;
}

班级活动：

public class SelectEventArgs : EventArgs
{
  private int index;
  public SelectEventArgs(int index)
  {
     this.index = index;
  }

  public int ItemIndex
  {
    get
    {
      return index;
    }
  }
}

我控制中的自定义事件：

public event EventHandler SelectEvent;
protected virtual void OnSelectEvent()
{
  if (SelectEvent!= null)
    SelectEvent(this, new SelectEventArgs(this._SelectIndex));
}

我需要一个事件来获取和设置MainForm中的属性值，如下所示：

int index = 0;
public Form1()
{
  InitializeComponent();
  this.icontrol = new iControl();
  this.SelectEvent += Select();
}

void Select(object sender, SelectItem e)
{
   //use this to set value of Select
   this.icontrol.SelectIndex = index;
   //and this to get value of Select
   index = this.icontrol.SelectIndex;
}

选择为空。如何让它工作？

Answer 1

代码有多个问题。请考虑以下提示来解决问题：

SelecetEvent不属于Form。该活动属于icontrol。
this.SelectEvent += Select();不正确，您应该使用：
```
icontrol.SelectEvent += Select;
```
如果您有自定义事件参数，则应以这种方式定义事件：
```
public event EventHandler<SelectEventArgs> SelectEvent;
```
您应该使用自己创建的OnSelectEvent方法在属性的setter中引发事件。

要了解有关活动的更多信息，请查看C# Handling and Raising Events。

Answer 2

我在这里张贴任何人都需要它：
1.Declare代表：

public delegate void SelectIndexEventHandler(object sender, SelectEventArgs e);
public class SelectEventArgs : EventArgs
{
  private int index;
  public SelectEventArgs(int index)
  {
    this.index = index;
  }

  public int ItemIndex
  {
    get { return index; }
    set { index = value; }
  }
}

2。声明一个事件SelectIndexChanged和一个方法OnSelectIndexChanged：

public event SelectIndexEventHandler SelectIndexChanged;
protected virtual void OnSelectIndexChanged(SelectEventArgs e)
{
   if (SelectIndexChanged != null)
      SelectIndexChanged(this, e);
}

3.在setter中打电话：

public int SelectIndex
{
   get { return _SelectIndex; }
   set { 
     _SelectIndex = value;
     OnSelectIndexChanged(new SelectEventArgs(value)); 
   }
}

然后是MainForm：

this.gListBox1.SelectIndexChanged += icontrol_SelectIndexChanged;
void icontrol_SelectIndexChanged(object sender, SelectEventArgs e)
{
   var current = e.ItemIndex;
}

再次感谢jbmintjb Reza Aghaei。

Answer 3

查看列表框控件上的SelectedIndexChanged事件，认为这就是您要找的内容

USer控件自定义事件和设置get属性

3 个答案: